Fix chart linting issue in evg/run_pre_commit task (#470)

# Summary

The helm chart linting functionality is added as part on `lint_repo`
task eventually called our precommit script. Apart from the lint_repo
task, precommit script also gets called from the evg task
`evg/run_pre_commit`. And when it's run via `evg/run_pre_commit` it's
failing, because `ct` is not found. We forgot to update the
`evg/run_pre_commit` task to setup `ct` because it's doesn't get run in
PR patches.
Since this task (`evg/run_pre_commit`) doesn't get executed as part of
PR patches, we didn't face this problem in PR patches. But we got to
know about it from [a
PR](#468) that
dependabot raises.
In PR patches the task `evg/run_pre_commit` gets run but the precommit
script doesn't actually get executed because it's requires the branch
name to be in [specific
format](https://github.com/mongodb/mongodb-kubernetes/blob/master/scripts/evergreen/precommit_bump.sh#L18).

## Proof of Work

Successful CI in this PR.
- Make sure lint_repo passes
- Make sure run_pre_commit passes and it actually calls precommit,
because this PR branch is named in the format `_version_bump`, that is
expected by `run_pre_commit`.
https://github.com/mongodb/mongodb-kubernetes/blob/master/scripts/evergreen/precommit_bump.sh#L18

## Checklist

- [ ] Have you linked a jira ticket and/or is the ticket in the title?
- [x] Have you checked whether your jira ticket required DOCSP changes?
- [x] Have you added changelog file?
    - use `skip-changelog` label if not needed
- refer to [Changelog files and Release
Notes](https://github.com/mongodb/mongodb-kubernetes/blob/master/CONTRIBUTING.md#changelog-files-and-release-notes)
section in CONTRIBUTING.md for more details

Author: viveksinghggits

.evergreen-functions.yml

@@ -242,6 +242,15 @@ functions:
         - ${workdir}/bin
       binary: scripts/dev/setup_evg_host.sh
 
+  setup_chart_testing_cli: &setup_chart_testing_cli
+    command: subprocess.exec
+    type: setup
+    params:
+      working_dir: src/github.com/mongodb/mongodb-kubernetes
+      add_to_path:
+        - ${workdir}/bin
+      command: scripts/dev/setup_chart_testing_cli.sh  
+
   lint_repo:
     - command: subprocess.exec
       type: setup
@@ -250,13 +259,7 @@ functions:
         add_to_path:
           - ${workdir}/bin
         command: scripts/evergreen/setup_yq.sh
-    - command: subprocess.exec
-      type: setup
-      params:
-        working_dir: src/github.com/mongodb/mongodb-kubernetes
-        add_to_path:
-          - ${workdir}/bin
-        command: scripts/dev/setup_chart_testing_cli.sh
+    - *setup_chart_testing_cli
     - command: subprocess.exec
       type: test
       params:

.evergreen.yml

@@ -311,6 +311,7 @@ tasks:
       - command: github.generate_token
         params:
           expansion_name: GH_TOKEN
+      - func: setup_chart_testing_cli
       - command: subprocess.exec
         type: setup
         params: